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BOD-Measurement
Technical data
Meas. principle
Inductive stirring system
Manometric; mercury-free;
electronic pressure sensor
Ranges 0 - 40, 0 - 80, 0 - 200,
[mg/l O 2 ] 0 - 400, 0 - 800,
0 - 2000, 0 - 4000 mg/l
Accuracy* 0.5 % full scale at 20°C
Applications BOD 5 , BOD 7 , OECD 301 F ...
Result display
Measurement
parameter display
Measurement
period
Auto result
storage
Storage
interval
Automatic
start function
Power
supply
BOD [mg/l]; 4 - digits ; 7 - segment LED
BOD-range, volume, duration,
time of measurement
User-selectable, between
1 and 28 days
Up to 28 results, depending
on measurement period
– hourly (1 day)
– every 2 hours (2 days)
– daily (3-28 days)
– After temperature
equalisation of samples
– Can be switched off
3 alkaline-manganese
batteries (“Baby” cells/size “C”)
Battery life 1 year (normal use as BOD 5 meter –
max. one reading a day); early warning
before battery fails
Interface
RS 232 for printer or PC connection
Clock
Real-time clock
Protection class IP 54 (sensor head)
Dimensions
375 x 195 x 230 mm
(L x W x H) including stirring unit
Weight
3850 g, unit with bottles
5750 g, complete with stirring unit
Housing
ABS
Approval
CE
* No standard is available to check the accuracy of respirometric oxygen uptake
measurement. Tests with a glucose-glutamic acid solution having a known theoretical
BOD have shown that the variation is approximately 5% in the range of 50…100 mg/l BOD,
and 3% for higher range. Minimum Response or sensitivity of respirometric systems is about
0.05 … 1 mg/l.
The microprocessor-controlled AQUALYTIC ® inductive stirring
system is non-wearing and maintenance-free. In other words,
there are no moving parts in the system.
At regular intervals, the magnetic stirring rods are accelerated
and slowed down again, taking them up to maximum speed
and back down again. This ensures the centralization of the
stirring rods.
Stirring rods that move away from the centre of the bottle are
re-centered quickly and reliably.
The inductive actuation system guarantees maintenance-free
operation (no need to replace drive belts or burnt-out drive
motors) for many years.
Highlights
■ Maintenance-free and non-wearing
■ Regular change in stirring speed
■ Automatic centering of stirring rods
■ No mechanical components in
the stirring system
Accessories
Item
Test set for AL606
We also supply a test set to check for correct operation of the
AL606 BOD meter. The set contains 8 BOD CM1 test tablets that
cause a defined oxygen consumption.
The tablets are easy to use. Simply place a tablet in the BOD
bottle, start the measurement process, read off the BOD value
after 5 days, and then compare with the defined value. If this
value is within the quoted tolerance, this means that the BOD
measuring system is functioning correctly.
Temperature equalisation during BOD
measurement
Order code
Sensor head 2444430
BOD sample bottle 418644
Brown glass, 500 ml
BOD sample bottles, Brown glass, 418645
500 ml, set of 6 bottles
Cable for connection to a PC 2444440
serial 9-pins
Inductive stirring system 2444451
for 6 samples, 110-240 V / 50-60 Hz
Stirring rod 418637
Stirring rod remover 418638
Rubber gasket 418636
Chemicals:
Potassium hydroxide solution 2418634
45 %, 50 ml
Nitrification inhibitor (N-ATH) 2418642
50 ml
Overflow flask, 21.7 ml 418664
Overflow flask, 56 ml 418655
Overflow flask, 94 ml 418656
Overflow flask, 157 ml 418657
Overflow flask, 244 ml 418658
Overflow flask, 360 ml 418659
Overflow flask, 428 ml 418660
Complete set 418654
Overflow flasks
Test set, BOD CM test tablets, 418328
box with 8 tablets
Temperature equalisation is essential prior to biological testing,
as temperature has a major effect on biological activity. BOD
measurements, for example, are always performed in a thermostatically
controlled cabinet at a temperature of 20°C.
For temperature equalisation, we recommend AQUALYTIC ®
thermostatically controlled cabinets with a user-selectable
temperature from 2°C to 40°C.
57
General Catalogue January 2010